Time-limit relay.



G. A. BURNHAW TIME Lllvl RELAY. APPLICATION HL'EDFEB. 5, 1913.

1,140,249. Patented May 18, 1915. l

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GEORGE 1L BUBNHAM, OE SAUGUS, MASSACHUSETTS, ASSIGNOR TO SEARS B. CDNBIT,

JR., OFF BROGKLINE, MASSACHUSETTS.

TME-LIMIT RELAY.

tisanes.

Specilcaton of Letters Patent;

Paten-ted May-18, 1915.

v.application led February 5, 1918. Serial "l'orll` To all whom it may concessa.' u

l Be Vit known that Geenen A..BURNHAM, a citizen vof the United States, residing at Sangue, in `the county of Essex andState of Massachusetts, have invented an lmprove- Ament in Time-Li1nit Relays, of 'which the following is a specification.

This invention relates to time-.limit re- Alays and is intended as an improvement on .the time-limit relay shown in Letters Patent #1,041,716, dated Oetoberl, 1912.

The invention has for its object certain improvements in the means for operating the switch-controller or switch atthe end of Va predetermined period of time, which is simple, not liable to become injured when pits eoperative parts are moved suddenly anto engagement with each other, not liable adapted for a Wide range of adjustment, and in all posi vtions ,of adjustment the operating device is *moved against lthe full force of its' return spring.

Figure 1' is a side elevation ofa time-limit :relay :embodying this invention. a plan View of the switch-controller and operating device therefor. Fie. 3 is a front view 'of the parte` shown in Fig. 2.

The controller for the switch, as here shown, consists of a circuit-closer for the circuit of a A'trippingcoil, yet in Ilieu thereof Yany .for-1n lof switch-controller may be employed. Said circuit-closer comprises a pair of 'stationarily supported circuit-blos` ing members 12, i3, and a movable fcir cuit Vclosing member 14, .adapted to engage said stationary members. Said movable ciri cuit-closing :member is here :represented-'as an upright pin arranged fon a rotatable frio tion-disk l5, at a `place quite Well removed `from the axis and said disk is arranged in acentral vertical spindle 1G, which has its bearing in an arm lf. Said friction-disk is arranged beneath a ffrictioimvlieel 2l), secured to a horizontally arranged rota-table vshaft 21, and is movable Vinto and out of enscrew 18. A very may be obtained by thus adjusting the posi-` Fig. 2 is axis of the disk, which may be accomplished by securing said Wheel to its shaft in justable manner, as for instance,

an ad* n by a set- Wide range of adjustment tion of the wheel 20. The shaft 21 may be calibrated to determine the position of the wheel, and thus the friction-disln In the patent aforesaid engagement of the speed of rotation of the .operating device with its actuator and also rotary movement of the actuator is -con- .trolled by means responsive to an overload,

and, ashere shown, rotary type,

an electric-motor of the 4Similar to Ithat shown in the .aforesaid patent, is employedl which lis constructed and arranged v,to move-the fricti0ndisk into engagement With the frietion-v Wheel and permit of disengagement therefrom, and also :to rotaie the friction-Wheel, thereby to operate the switch-controller. flint in lieu of this vmeans for accomplishing this result other .means may be employed which admits of engagement of the disk and Wheel upon the occurrence of an overload and of disengagement thereof upon cessation of the overload, and which positively ro tates the friction-wheel, thereby to drive the disk. As here shown, the shaft 21 to which the friction-Wheel isadjustably secured is represented as an extension of the shaft of `the .armature 4S of the motor, and the field- .frame of the motor is divided horizontally y orfotherwise, representing the upper part .a horizontal plane and has on its under side and 51 the lower partthereof, and said parts are 'hingedly connected together at 52, so

:fthe frietion-disk is in accordance y that the lower part is movable toward and vfrom the upper part Which latter' is held stationary. Movement of said lower part of the field frame in a direction away from the upper part is limited by any suitable means, and movement toward the-'upper part is oontrolled by any `suitable means, so far the present invention is concerned, although, as here shown, said frame has 'an ear 53, With yielding stops associated with it, see Fig. |`1. The arm l-7 bearing the friet onsdislr is lpivo'tally connected te the lower ler part of the field-frame and is supported in a yielding manner by a spring 19,'so that when said lower part is moved suddenly by the attractive force of the magnet fieldthe said friction-disk is moved suddenly into enuntil a pin 2G on the disk strikes a pin E27 on the arm, thus limiting its backward movement, and determining its normal position and also the normal position of the circuitclosingl member 14.

Inthe present construction the frictiondisk always returns to its normal position or starting point, which position is not adjustable or variable, so that when moved rotarily by the friction-wheel it is always moved against the full force of the returnspring regardless of the speed incident to the relative dispositions of the disk and wheel.

In operation, uponA the occurrence of an overload the lower part of the field-frame of the motor will be attracted and the frictiondisk will be moved into engagement .with the friction-wheel, and the shaft of the motor will be rotated thereby rotating the friction-wheel and thus rotating the fric` tion-disk which, at suelr timeis in engagement with it, thus to cause the pin 14: to engage the circuit-closing members 12, 13, and upon cessation of the overload said friction-disk will be permitted to immediately retract thus disengaging the friction-wheel, and also said friction-disk will be restored immediately to normal position by its return-spring. y

My present invention is not limited to all the structural details here shown, as it is obvious they may bechanged without departing from the spirit and scope of the invention.

I claim l 1. In atime-limit relay, a friction-wheel, means respofisvy) to an overload to rotate said wheel, tlf i tatable friction-disk arranged with its anis at right angles to the axis of said wheeland -movable into and out of engagement with the periphery of said wher-l, and when in engagement therewith yto be rotated by it, and a controller for the switch operated by said frictiondisk, substantially as described.

2. In a'time-limit relay, a rotatable friction-wheel, a rotatable friction-disk arranged with its axis at right angles to the axis of said wheel and movable into and out of engagement with the periphery of said wheel and when in engagement therewith to be rotated by it, means responsive to an overload. to move said disk into engagement with said wheel, permitting disengagement upon cessation of the overload, and a controller for the switch operated by said disk, substantially as described.

3. In a time-limit relay, a rotatable friction-wheel and a .rotatable friction-disk arranged with its axis at right angles to the axis of said wheel and movable into and out of engagement with tbe periphery of said wheel and when in engagement therewith to be driven byit, means responsive to an overload tov move said disk into engagement with said wheel and also to rotate said wheel, and a controller for the switch operated by said friction-disk, substantially as described.

4C. In a time-limit relay, a rotatable friction-wheel, a C. rotatable friction-disk arranged with its axis at right angles to the axis of said wheel and movable into and out of engagement with the periphery of said wheel and when in engagement therewith to be rotated by it, means responsive to an overload to move said disk into engagement with said wheel, permitting disengagement therefrom upon cessation of the overload, a spring to return said disk to normal. position when disengaged from the wheel, and a controller for the switch operated by said disk, substantially as described.

5. In a time-limit relay, a rotatable friction-wheel, a rotatable friction-disk arranged with its axis at right angles to the axis of said wheel and movable into and out of engagement with the periphery of said wheel and when in engagement therewith to be rotated by it, a yielding arm bearing said disk, vmeans responsive to an overload and connected with said arm to move said disk into engagement with said wheel, permitting disengagement therefrom upon cessation of the overload, and a controller for the switch operated by said disk, substantially as described. i

6. In a time-limit relay, a rotatable friction-wheel, a rotatable friction-disk arranged with its axis at right angles to the axis of -said wheel and movable into and out of engagement with the periphery of said wheel, and when in engagement therewith to be rotated by it, means responsive to an overload to move said disk into engagement with said wheel,` means to disengage said 'disk from said wheel upon cessation of the overload, and means to impart retrograde motion to said disk when disengaged from the wheel to return it to normal position,

and a controller for the switch operated by said disk, substantially as described.

7. In a time-limit relay7 an electric-motor responsive to an overload, a friction-wheel adjustably secured to the sh aft/of said motor, a rotatable friction-disk arranged with its axis at right angles to the axis of said wheel and movable into` and out of engagement with the periphery of said wheel and when enti, e controller for tbe Mii time@ tnere'witii to be rotated by it, evifiteh operated by seid i'ictioii-diel, substantially es described.`

.in u. time-limit relay, en electric-motor pensive to en overload, o. friction-Wheel erriinged on the shaft of seid motor, ero teteble friotionnieb arranged with its exiset right 'ongles to the exis et' seid Wheel sind tov be rotated by seid Wheel when in engagen ment therewith, end movable means supportingl eeiol rietiondisli; arranged in the insign o held. of the motor, whereby seid dielr is movable into end out of engagement with seid wheel respectively upon occurm renee and cessation of the overload, emi ev .=3\vito.h-controlling,i member operated by Said dish, substentielly es described.

9. ln e timelimit relay, an electric-motor responsive to en overload, bowing :i part of its lieldffranie mode movable, a riction wheel eecnred to the shaft olf the motor, e` rotatable friction-disk borne by seid movable portion of the wheel frame arranged with its exiset right angles to the exis of' the friction. Wheel, seid disk being movable into and. out of engagement with said Wheel respectively upon the occurrence and cesso tion of an overload, and rotated. by seid wheel While in engagement therewith, and a. entitcb-controller operated by said disk, substantially :is described. l v

O. In, e t nie-limit relay, on electi; motor responsvewo en overload having` o.

'port of itsflield-irainexmode movable, a.

friction-wheel secured. to the ebait of the motor, e rotatable vfriction-elisir yielclingly connected with seid movable portion of the elcl-freme and arranged with its axis et right ongles to the axis of the friction-wheel, seid dislrbeing movable into and out of en gage/ment with seid wheel respectively upon the occurrence and cessation of en overload, and rotated by Vseid. wheel while in engagen ment therewith, and a. switch-controller operated by Seid disk, substantially es de scribed.

il. ln e time-limit relay, en electric- Inotor responsive to an overload having e part of its iieldffranie made movable, :i friotion-Wheel secured to the motor shaft, a rotetable friction-disk arranged with its axis et right ongles to the axis ol the wheel, en arm bearing said disk which is pivotelly connected to and ylelflingly Supported by seid' movable port of the held-frame, wl1ereby seid disk is movable into and ont oi engagement with seid wheel respectively upon the occurrence undA cessation of en overload, and is rotated by seid wheel while in engagement therewith, and ewitclbcontroller operated by said disk, eulistentially es described.

In testimony whereof, I have Signed my name to this speciicetion, in the presence of two subscribing Witnesses.

GEORGE A. BURNHAM. l Witnesses:

B. J. Noves, H. B. Devis. 

